Air-compressing plant.



0. M. BERGSTROM.

' AIR GOMPRESSING PLANT.

APPLICATION IIYLED SEPT. 26, 1910.

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0. M. BBRGSTROM,

AIR GOMPRESSING PLANT.

APPLICATION FILED SEI T. 26, 1910.

1,011,400, T Patented Dec. 12,1911.

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' OSCAR M. BERG-STROM, OF MINNEAPOLIS, MINNESOTA.

AIR-COMPRESSING PLANT.

Specification of Letters Patent.

Patented Dec. 12, 1911.

Application filed September 26, 1910. Serial No. 583,717.

To all whom it may concern:

Be it known that I, OSCAR M. BERcsTRoM, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Air-Compressing Plants; and I do hereby declare the following to be a full, lear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use thesame.

My invention has for its object to provide a self contained and portable air compressing plant of high efficiency, and to this end the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

An air compressing plant of the character above indicated is capable of a wide range of use, but will be found especially serviceable for use in private and public garages for charging pneumatic tires.

The complete plant comprises an engine and an air pump and all of the cooperating accessories mounted on a common base support, or otherwise so connected that the established relation between the parts is maintained when the device is moved as an entirety.

In the accompanying drawings which illustrate the invention in its preferred form, like characters indicate like parts I throughout the several views.

Referring to the drawings; Figure 1 is a plan view showing the complete plant, some parts being broken away; Fig. 2 is a side elevation of the plant; Fig. 3 is a view chiefly in vertical. section on the line 00 00 of Fig. 1, but with some parts shown in full elevation and with some parts broken away; and Fig. 4: is a horizontal section taken on the line w 40* of Fig. 3.

Preferably, an explosive engine of the four-cycle type, is employed to operate an air pump, and the cylinders 1 and 2, respectively, of the said engine and pump are axially alined and rigidly secured at diametrically opposite points to a casing 3 which affords a crank shaft chamber. As shown, the crank shaft chamber 3 has rigidly .secured heads 4: and 5, the latter of which is cast integrally with a bearing 6 rigidly secured at its lowerend to a base plate 7 and to a hollow box or exhaust chest 8, which latter is shown as cast integral with the said base 7. A gasolene tank 9 is shown as cast integral with the shell of the crank shaft chamber 3. As shown, this tank 9 is provided with a detachable cover 10 having a removable plug 11.

The outer portion of the engine cylinder 1 is surrounded by a water jacket which is preferably afforded by the lowerextremity of a water containing tank 12, shown as cast integral with the said cylinder 1 and provided at its upper portion with ahollow bulb 13. Working within the engine cylin der 1 is a piston 14: that is connected by a wrist pin 15 to one end of the crank rod 16, the other end of which rod is pivoted to a crank 17 of the engine crank shaft 18. The said crank 17 works within the crank shaft chamber 3 and the shaft 18 is journaled in the bearing 6 and is provided at its projecting end with a fly wheel 19 and with a spur gear 20. Working within the pump cylinder 2 is a pump piston 21, the stem 22 of which works through a suitable guide head 23 in the inner end of the cylinder 2 and is connected by a link 24 to the wrist pin 15 of the pumping piston 14.

The outer end of the pump cylinder 2 is provided with an air intake valve 25 and with an outlet valve 26, which latter controls a port. leading to an air discharge pipe 27. The air discharge pipe 27 leads to a small air storage tank 28 rigidly secured on the base 7 and provided with a discharge tube 29, to which an air delivery hose or flexible tire charging hose, not shown, is adapted to'be connected. The numeral 30 indicates a pressure gage which is connected to the air storage tank or reservoir 28 and which serves to indicate the pressure of the air stored therein.

The explosive engine may be of the customary, or of any suitable type, the construction and operation which we may as sume to be well understood. For the purpose of this case it is only desirable to state that the engine. as designed, is provided with a spring closed exhaust valve 31, the

stem of which, is shown as projecting in Fig. 1. The numeral 32 indicates an ordinary spring closed, suction opened air intake valve. The stem 31 is engaged and operated at the proper times by a lever 33, shown as intermediately pivoted to a stud 34:, projecting from the water tank12. The other end of the lever 33 is connected by a link 35 to a plunger 36, shown as mounted in a keeper 37 on the bearing 6and provided with a roller 38. The roller 38 is adapted to be engaged by a cam 39 carried by a small counter shaft 40 journaled in the bearing 6 and provided with a spur gear 41 that meshes with the spur gear 20 of the engine shaft 18. This being a four-cycle engine, the gear 41 is made twice the diameter of the gear 20.

The numeral 42 indicates a carbureter which receives gasolene from the tank 9 through a pipe 43, and delivers air and vaporized oil to the engine cylinder.

The numeral 44 indicates an oil cup which is arranged to deliver oil to the crank chamber. The head 4 of the crank shaft chamber 3 is shown as provided with screen covered breathing ports 45. The exhaust from the engine cylinder 1 is connected by a pipe 46 to the exhaust chest 8. In the exhaust chest 8 is a perforated tubular exhaust muflier 47, one end of which, .opens to the atmosphere through a final exhaust port 48 located in one end of the exhaust chest 8 -With this exhaust arrangement, the exhaust gases from the engine cylinder are immediately discharged into and expanded within the exhaust chest 8 and are permitted to continuously escape from the exhaust chest 8 to the atmosphere through the perforated muffler 47 and final exhaust port 48. The head 23 in the inner end of the pump cylinder 2 is highly important because it prevents oil from the crank chamber 3 being thrown or drawn into the said pump cylinder. If lubricating or other oil were permitted to enter the pump cylinder it would be vaporized and carried with the compressed air into the automobile tires or other devices charged by the compressed air; and such action Would be very objectionable for well known reasons. The efiect of the combined exhaust chest 8 and muflier 47 is to produce a nearly silent exhaust without producing any considerable amount of back pressure.

From the above, it will be seen that the improved air compressing plant is a complete unit, or self contained apparatus, capable of being easily transported or moved about without in any way disturbing the adjustments of the parts or requiring any connections or disconnections to be made.

hat I claim is:

1. A self contained portable air compressing plant comprising a common base or support having an exhaust box and a bearing thereon, an explosive engine and a pump driven thereby, both mounted on said bearing, a fuel tank connected to said engine, and an exhaust passage connecting said engine to said exhaust chest, said exhaust chest being open to the atmosphere, substantially as described.

2. A self contained portable air compressing plant, the combination with a common base or support having an exhaust box and a bearing thereon, of an explosive engine and an air pump mounted on said bearing, an exhaust pipe connecting the exhaust of sald engine to said exhaust box, and a perforated mufiier located in said exhaust box and connected to the atmosphere, substantially as described.

3. In a self contained portable air compressing plant, the combination with a common base or support and a bearing thereon, of a crank chamber casing secured to said bearing and an explosive engine and an air pump having axially alined cylinders secured to said casing, the said engine being arranged to operate said pump, substantially as described.

4. In a self contained portable air compressing plant, the combination with a common base or support and a bearing thereon, of a crank chamber casing secured to said bearing and an explosive engine and an air pump having axially alined cylinders secured to said casing, the said engine being arranged to operate said pump, and a fuel tank on said casing connected to the cylinder of said explosive engine, substantially as described.

5. In a self contained portable air compressing plant, the combination with a common base or support and a bearing thereon, of a crank chamber casing secured to said bearing and an explosive engine and an air pump having axially alined cylinders secured to said casing, the said engine being arranged to operate said pump, and a water tank secured to the cylinder of said engine with its lower portions surrounding the working end of said cylinder, substantially as described.

6. In a self contained portable air compressing plant, the combination with a common base or support and a bearing thereon, of a crank chamber casing secured to said bearing, an explosive engine and an air pump having axially alined cylinders secured to said casing, the said engine being arranged to operate said pump, a fuel tank located on top of said casing and connected to the cylinder of said engine, and a water tank, the lower portion of which surrounds the working end of the cylinder of said engine, substantially as described.

7. In a self contained portable air compressing plant, the combination with a common base having an exhaust box and a bearing thereon, of a crank chamber casing secured to said bearing above said exhaust box, an explosive engine and an air pump having horizontally disposed axially alined cylinders secured to said casing, and a crank shaft and cooperating connections for causing said engine to operate said pump, substantially as described.

8. In a self contained portable air compressing plant, the combination with a common base having an exhaust box and a bear ing thereon, of a crank chamber casing secured to said bearing above said exhaust box, an explosive engine and an air pump having horizontally disposed axially alined cylinders secured to said casing, a crank shaft and cooperating connections for causing said engine to operate said pump, and a fuel tank mounted on said casing and connected to the cylinder of said engine.

9. In a self contained portable air compressing plant, the combination with a common base having an exhaust box and a bearing thereon, of a crank chamber casingsecured to said bearing above said exhaust box, an explosive engine and anair pump having horizontally disposed axially alined cylinders secured to said casing, a crank shaft and cooperating connections for causing said engine to operate said Pump, and an air storage tank secured on said base and connected to said air pump, substantially as described.

10. In a self contained port-able air compressing plant, the combination with a common base having an exhaust box and a bearing thereon, of a perforated muffler in said exhaust box open to the atmosphere, a crank chamber casing secured to said bearing above said exhaust box, an explosive engine and an air pump having horizontally disposed axially alined cylinders secured to said casing, a crank and cooperating connections in said casing causing the said engine to operate said pump, a fuel tank on said casing connected to the cylinder of said engine, an exhaust pipe connecting the en gine to said exhaust box, a water tank secured on the cylinder of said engine with its lower portion surrounding the working end thereof, and an air storage tank on said common base connected to and receiving air from said pump, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

OSCAR M. BERGSTROM.

Witnesses:

HARRY D. KILooRE, F. D. MERCHANT.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of latents, Washington, D. G. 

